/in/foo.c: In function 'main':
/in/foo.c:3:5: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
     printf("请输入整数n (n < 10000): ");
     ^~~~~~
/in/foo.c:3:5: warning: incompatible implicit declaration of built-in function 'printf'
/in/foo.c:3:5: note: include '<stdio.h>' or provide a declaration of 'printf'
/in/foo.c:4:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%d", &n);
     ^~~~~
/in/foo.c:4:5: warning: incompatible implicit declaration of built-in function 'scanf'
/in/foo.c:4:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
/in/foo.c:17:15: warning: implicit declaration of function 'FindMin' [-Wimplicit-function-declaration]
     int min = FindMin(a, n);
               ^~~~~~~
/tmp/ccf2qLye.o: In function `main':
foo.c:(.text.startup+0xa1): undefined reference to `FindMin'
collect2: error: ld returned 1 exit status